Mass alexa rank checker will automatically check a huge list for the alexa rank of each domain from that list. This feature is particularly useful because you can then sort the urls/domains by their alexa rank and thus you will have the sites with most traffic on the top/bottom. With the SEO Toolkit you will run an Alexa rank mass check in seconds and because of the revolutionary technology behind the Alexa Mass checker you will have your results in minutes.
The mass alexa checker feature can be used together with the mass PR/DMOZED/Yahoo Backlinks checker. You might not have hundreds of thousands of domains to do a mass alexa check like I do but I am sure you will love the mass alexa checker and its lighting speed.